Electric ore-separator



(No Model.)

H. GREVE.

ELECTRIC ORE SEPARATOR.

Patented July 31, 1883.

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UNITED STATES PATENT OEEicE- HERMAN ennvn, on sr. PAUL, MINNESOTA.

ELECTRIC ORE-SEPARATOR.

SPECIFICATION forming part of Letters Patent No. 282,073, dated July 31, 1883.

Application filed October 23, 188-2. (No modehl To all whom, it may concern:

Be it known that I, HERMAN GRnvE, a citizen of the United States, and a resident of St. Paul, in the county of Ramsey, in the State of Minnesota, haveinvented certain new and useful Improvements in Electric Ore-Separators, of which the following specification is a full, clear, and exact description, reference being also had to the accompanying drawings, in Which- Figure 1 is an end view, Fig. 2 is a crosssectional view, Fig. 3, is a side view, and Fig. 4 1s a sectional plan view, of the separator. Figs. 5, 6, and 7 are enlarged detail views of the brush-formed circuit-closer.

This invention relatesto apparatus for separating'the magnetic particles of pulverized particularly described, and then sought to be specifically defined by the claims.

The cylinder consists of longitudinal segmental sections A, of steel, attached to a suitable circular wood or metal frame, B, mounted upon a shaft, O, as shown. The shaft is journaled in any form of frame D, and adapted to be rapidly revolved in any suitable manner, either by gears E, as shown, or by pulleys, or any other means.

Upon the outer surface of the cylinder, at either end, small flanges a are formed, next to which, around the face of the cylinder, small bands I), of vulcanized'rubber or other non-conducting material', are stretched, and over these non-conducting bands steel hoops or ring s F are placed, the nonconducting bands being arranged to completely insulate the steel hoops from the cylinder, whereby the electric cur rent is prevented from short-circuiting through the metal of the cylinder.

Inside the cylinder a coil, G, of silk-covered copper wire, is placed by suspension from the cylinder or otherwise, the outer coils being secured in close contact with the interior of the cylinder. The ends of the coil. run in opposite directions and pass outward through the frame B, cylinder A, non-conducting bands I), and steel bands or hoops F, the wire, where it passes through the frame, cylinder, and hoops, being insulated therefrom by its silk covering, but with the ends 6? a exposed out side the hoop, as shown.

Attached to the frame D at points-opposite the hoops F are bruslrshaped circuit-closers, consisting of heads or bodies H H", in which a number of copper wires, 0, are held and bound tightly around central wires, d (P, which extend directly to the dynamo-machine, or may first pass through rheostats K K; by which the strength of the electric current may be regulated. By this construction the two brushshaped devices H form the ends of the poles of the dynamo-machine, and then, when the cylinder is revolved and the projecting exposed ends e e of the coil G come in contact with the brushes H H an electric circuit will be formed between the dynamo-machine and the coil G while the brushes are in contact with the ends 0 c and the circuit will be broken while the insulated steel bands F are traveling beneath the brushes duringthe remainderof the revolution of the cylinder on its axis. The coil G being in close contact with the interior of the cylinder A, the latter is magnetized and becomes a revolving electromagnet, and the cylinder is thus remagnetized once at every revolution.

Being formed of steel, the cylinder retains its magnetic qualities during the lapses between the breaks in the circuit, and by re-' charging it at every revolution a permanent magnet is secured. A

Fig. 7 shows a slight variation in the form of a' circuit-closer, consisting of the central wire, d or (1 around which the smaller wires 0' are tightly bound, and the whole secured by a bracket or brace, It, to the frame D; but the action is the same as when the brush is formed as shown in Fig. 6. Above the cylinder A, on one side,a hopper, L, is suspended, having a narrow adjustable exit, 9, through which a thin even stream of pulverized iron or other ore is fed over the cylinder. This hopper will be made of zinc or other suitable material that will not affect the magnetic qualities of the cylinder.

TOO

Just beneath the circuit-closers H H a sta tionary scraper or brush, M, of rubber or any other non-conducting material, is arranged to rest against the whole surface of the cylinder lengthwise and scrape off the adhering particles of metal. as the cylinder revolves.

Beneath the cylinder A, and in aline below the hopper L, is a trough or spout, N, into which the nonmagnetic particles from the ore will fall from the hopper and cylinder, and below the scraper or brush. M is a similar spout, P, into which the magnetic particles of the ore fall when scraped from the cylinder bythe brush.

The ore, as before stated, is finely pulverized and run in a thin stream upon or in close proximity to the revolving magnetized cylinder A, which attracts the magnetic particles and causes them to adhere to its surface, and carries them around until brushed oii' by the scraper M and dropped into the trough I, while the non-magnetic particles fall directly into the trough N. By this means the magnetic and non-magnetic particles are easily and quickly separated.

The cylinder can be made of any desired size or form; but I have found that about three feet in diameter and twenty feet long will give the most satisfactory results.

Instead of the coil of insulated wire within the cylinder, an electro-magnet may be used with the ends of the coil extending through the cylinder the same as the ends of the coil of wire, and when the phrase coil of insulated wire is used it is to be understood as applying to the insulated coil or an eleetro-magnet as well as to a eoil of insulatedwire.

Having described my invention and set forth its merits, what I claim is- 1. In an electro-magnetic ore-separator, the combination of a steel cylinder, A, a magnetizing-coil, G, located inside of the cylinder and having its ends or electrodes arranged for 010s ing an electric circuit, the circuit-closing poles H H of a dynamo electric machine, and means for closing the electric circuit once in each revolution of the cylinder, substantially as and for the purpose herein specified.

2."The combination of the steel cylinder A, provided with insulated rings F F, and the interior magnetizing-coil, G, the insulated ends of which proj eet outward through the cylinder and its ring, substantially as and for the purpose herein specified.

3. The combination of the steel cylinder A, provided with insulated rings F F, the interior magnetizingcoil, Gr, whose insulated ends project outward through the cylinder and rings, and the metallic-brush poles H H sub stantially as and for the purpose herein specified.

In testimony whereof I havehereunto set my hand in the presence of two subscribing witnesses.

HERMAN GRE'VE.

Vitn esses:

(l. N. OODWARD, LoUrs FEEsnR, Sr. 

